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PFS StandardSpell Substitution

Source Player Core pg. 195 2.0
You don't accept the fact that once spells are prepared, they can't be changed until your next daily preparations, and you have uncovered a shortcut allowing you to substitute new spells for those you originally prepared.
You can spend 10 minutes to empty one of your prepared spell slots and prepare a different spell from your spellbook in its place. If you are interrupted during such a swap, the original spell remains prepared and can still be cast. You can try again to swap out the spell later, but you must start the process over again.